23 Capacitance & Inductance - ECE 110 M.-C. Brunet...

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ECE 110 M.-C. Brunet Capacitance and Inductance Handout 23 M.-C. BRUNET ECE 110 UIUC 23.1 resistance J resistor capacitance J capacitor inductance J inductor dissipates energy stores energy Capacitance : measures the ability of a component to store charge. Non linear IV characteristics Symbol C Unit F (Farads) Typically: μ F J pF 10 -6 10 -12 Capacitance M.-C. BRUNET ECE 110 UIUC 23.2 The parallel-plate capacitor usually represents the negative plate insulator (dielectric) Circuit symbol μ F Lab: or: plates (conducting surfaces) A dielectric material is a material that is not an electrical conductor but can conduct current if in the presence of an electric field.
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ECE 110 M.-C. Brunet Capacitance and Inductance Handout 23 M.-C. BRUNET ECE 110 UIUC 23.3 Capacitors: Uses As dynamic storage elements (DRAM) Blocking capacitor (AC reading in oscilloscope) To set limits at which electronics can switch. examples: J in oscilloscopes, sampling of displayed waveforms at 10 -10 s intervals J radio station selection (bandwidths) Conversion AC J DC, shunt capacitor filter (circuits with diodes). Capacitive microphone: sound pressure waves act to displace one of the capacitor plates and circuit J change in I or V. Vx = V(t) +V +V- Vout = α V(t) + _ X I M.-C. BRUNET ECE 110 UIUC 23.4 Capacitor J a given capacitance C C depends on the permittivity of the (dielectric) material. A (area) J d I C = ε A d (F) ε :[F/m] Relative permittivity ε r= ε ε o ε o (in vacuum) = 8.854pF/m Vacuum: ε r=1 Air: ε r = 1.0006 Teflon: ε r=2 Porcelain: ε r=6 Capacitance Equation Permittivity is
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ECE 110 M.-C. Brunet
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This note was uploaded on 09/16/2009 for the course ECE 110 taught by Professor Haken during the Spring '08 term at University of Illinois at Urbana–Champaign.

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23 Capacitance & Inductance - ECE 110 M.-C. Brunet...

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